Technical Guide P12y/EN FT/D22
User Guide
MiCOM P125/P126/P127 Page 67/108
4.5.9 Submenu [27] Undervoltage Protection (P127)
PROTECTION G1
Heading of Protection G1 menu.
To gain access to menu, press 2 and 6 until the
submenu is reached.
[27] Phase
Under Voltage
Heading of [27] submenu.
To navigate within submenu points, press 8 2. To
modify setting, press 5. Use 8 2 4 6 to scroll and set
available selections. Press 5 to confirm choice.
U< ?
Yes
Selection of the first alarm threshold function for phase
undervoltage (U<). Setting choice: No, Yes
If the user selects Yes, the following window is shown:
If the user selects No, the next window will show the
threshold menu U<<.
U<
2.0 V
Displays setting value for the alarm threshold.
Input voltage range 57–130V: from 2 to130V, in steps
of 0.1 V.
Input voltage range 220 –480V: from 10 to 480V, in
steps of 0.5 V.
t U<
150.00 s
Displays setting value for the trip threshold.
The setting range is from 0 to 600 s, in steps of 10ms
U<< ?
Yes
Selection of the second alarm threshold function for
phase undervoltage (U<<). Setting choice: No, Yes
If the user selects Yes, the following window is shown:
If the user selects No, next window will show the
submenu [27] Phase Under Voltage.
U<<
2.0 V
Displays setting value for the alarm threshold.
Input voltage range 57–130V: from 2 to 260V, in steps
of 0.1 V.
Input voltage range 220–480V: from 10 to 960V, in
steps of 0.5 V.
t U<<
600.00 s
Displays setting value for the trip threshold.
The setting range is from 0 to 600s, in steps of 10ms
By pushing 2 the next window will display the [27] Phase Under Voltage
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